/*
 * Copyright 2025 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package org.cangnova.cangjie.utils


class LockedClearableLazyValue<out T: Any>(val lock: Any, val init: () -> T) {
    @Volatile private var value: T? = null

    fun get(): T {
        val _v1 = value
        if (_v1 != null) {
            return _v1
        }

        return synchronized(lock) {
            val _v2 = value

            @Suppress("UNNECESSARY_NOT_NULL_ASSERTION")
            if (_v2 != null) {
                _v2!!
            }
            else {
                val _v3 = init()
                this.value = _v3
                _v3
            }
        }
    }

    fun drop() {
        synchronized (lock) {
            value = null
        }
    }
}

